Plug



May 17, 1938.

N. CHIRELSTEIN PLUG Filed Oct. 10, 1935 INVENTOR ATTORNEYS Patented May 17, 1938 UNITED ST TES PATENT" orrlcs 3 Claims.

My invention relates to the constructionof plugs for use in making electrical connections with a source of power.

The object of my invention is to provide an improved male or cap member of an electric plug, the body portion of which may be made of soft vulcanized rubber moulded in a single piece and which permits the blades of the plug to move laterally a limited distance to or from each other in fitting them in the female member of the plug. Referring to the drawing which forms a part of this specification:

Fig. ,l is a' front elevational view of the cap member showing one of the forms in which it i5 may be moulded. m

Fig. 2 is aside elevational view thereof. Fig. 3 is a plan view. Fig. 4 is an inverted plan view. Fig. 5 is a vertical sectional view showing the 2 electrical conductors and the means for holding them in the body portion of the plug.

Fig. 6 is a perspective view of one of the plug blades.

Fig. 'l is a perspective-view of a bar of in- 25 sulating material which serves to hold the blades intheir assembled position. The plug cap consists of four parts. It indicates the body portion made of soft rubber, and moulded to provide a vertieallyexw tending cylindrical bore ll, vertically extending sockets which are rectangular in cross section, and a slot l3 which extends transversely and is shaped to correspond to the shape of the cross or lock-bar M in cross section.

' 35 l5--i5 respectively indicate the blade members of the plug, the upper ends of which flt closely in the sockets it as shownin Figure 5.

The blades are each provided'with a rectangular slot through which the lock-bar passes no close fitting relation.

I prefer to form the slots 13 at each outer end thereof as shown at E3 to facllitate the insertion of the lock-bar and also to provide upwardly extending portions of the body to form shoulders 45 or abutments it-IB respectively, and to make the bar of a length such as to permit its ends to rest between said shoulders to prevent it from being too easily displaced.

The body is preferably shaped as shown to reso duce its weight, and is provided with embossed ribs ll shaped to givean ornamental appearance and also to aflorda better gripping surface to the fingers in handling the plug. 1

' Inassembling the parts, the ends of the wire stat conductors iB-lt respectively arefirst passed' thru the bore it and then connected to theblade members by soldering them in the holes lS-IQ respectively, then drawing the assembled parts upwardly until the upper ends of the blades rest in the sockets as shown in Figure 5, after which 5 the lock-bar is inserted to complete the assembly.

Due to the elasticity of the rubber, the parts are held in close fitting relation, and also due to the same quality of the rubber, the blade elements are easily inserted in the female part of 10 the plug, and by spacing the blades a proper distance apart, the rubber may be stretched or compressed in the act of coupling, thus causing the blades to grip the female conductors frictionally and be held more firmly in position, thus also 15 insuring better conductivity.

Having thus described my invention I claim as new: a

l. A plug of the character described consisting of four parts comprising a body of moulded m elastic material having a central bore extending entirely, therethru and having sockets extending from the face of the plug parallel and in open communication with the central bore, said body having a slot extending transversely therethru and intersecting said bore and provided with a shoulder at each end thereof, blades resting in said sockets each of which blades is provided with an aperture in its shank, a lock-bar of insulating material in said slot and extending thru the aperture of each blade to hold the blades in position while the ends of the lock-bar rest between said shoulders; the body construction being such that the walls of thesockets support the blades at the face of the plug.

2. A plug of the character described consisting of four parts comprising a body of insulat ing material formed in a single piece with a central bore extending entirely therethru and with sockets extending parallel with said bore to the face of the plug and having a slot extending transversely through the body and intersecting said bore; blades resting in said sockets havin apertures therein, a lock-bar of insulating material located in said transversely extending slot and extending thru said blade apertures to hold said blades in position; said slot being increased in depth at its ends to permit easy removal and insertion of the lock-bar the inner ends of the blades having conductors attached thereto, and said blades being. removable from the face end of the plug without disconnecting the conductors from said blades and said blades being normally supported on all sides by the walls of the sockets in which they rest.

the face of the plug thru said transversely eitending slot, blades having apertures therein resting in said sockets, and a lock-bar 0!.imillating material located in said transversely extending slot and extending thru said blade apertures to hold the blades in position with the ends of the lock-bar engaged with said shoulders to prevent accidental displacement of the lock-bar, the body construction being such that said walls serve to support the blades at the face end 01' the plug.

NATHAN CHIREIS'I'EIN. 

